package com.beigai.imessage.common.util;

import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;

/**
 * Created by xxl on 2017/5/16.
 */
public class IPAddressUtil {

    public static String getIpAddr(HttpServletRequest request){
        String ip = request.getHeader("X-Real-IP");
        if (!StringUtils.isEmpty(ip) && !"unknown".equalsIgnoreCase(ip)) {
            return ip;
        }
        ip = request.getHeader("X-Forwarded-For");
        if (!StringUtils.isEmpty(ip) && !"unknown".equalsIgnoreCase(ip)) {
// 多次反向代理后会有多个IP值，第一个为真实IP。
            int index = ip.indexOf(',');
            if (index != -1) {
                return ip.substring(0, index);
            } else {
                return ip;
            }
        } else {
            return request.getRemoteAddr();
        }
    }
}
